Drill-sharpening apparatus.



A. H. SKAER.

DRILL SHABFENING APPARATUS.

APPLICATION FILED APR. I2. 1915.

Patented Nov. 9, 1915.

2 SHEETS-SHEET l.

H Ih" A. H. SKAER.

DRILL SHARPENING APPARATUS.

APPLICATION FILED APR. l2. |915.

Patented Nov. 9, 1915.

2 SHEETS-SHEET 2- l? f2 l A am UNITED STATES PATENT oEEIoE.

ARTHUR H. SKAER, OF DENVER, COLORADO, ASSIGNOR TO THE DENVER/'ROCK DRILLMANUFACTURING COMPANY,.OF DENVER, COLORADO, A CORCPOIEt-ATIONY 0F DELA-WARE DRILL-SHARPENING APPARATUS.

ratenteaNev.9,1e15.

Application led April 12, 1915. Serial No. 20,792.

To all whom it may concern Be it known that I, ARTHUR H. SKAEP., acitizen of the United States, residing at Denver, in the county or"Denver and State of Colorado, have invented new and useful Improvementsin Drill-Sharpening .Apparatus, of which the following is aspecification.

The present invention relates to drill sharpening apparatus, and moreparticularly to the clamping or die operating mechanism thereof.

One of the primary objects is to provide a compact structure, in which acylinder of relatively small diameter may be employed, together withmeans for effecting. a powen ful clamping action upon the relativelymovable die members, said means being actuated by the piston in saidcylinder.

In the drawings z-Figure 1 is a side elevation of a machine embodyingthe invention, and Fig. 2 is a vertical sectional view on the line 2-2of Fig. 1.

Similar reference numerals designate corresponding parts in all thefigures of the drawings. 'Y

In the embodiment disclosed, a base is employed, comprising a tubularlower portion 3 having an outstanding foot flange 4 and upstandingspaced side walls 5, said tubular portion thus forming an internal bore6 therein that communicates with an .internal chamber 7 formedbetweenthe side walls. The chamber 7 is accessible through opposite sides ofthe base, the openings, however, being normally closed by removableslides 8 having handles 9, whereby they may be readily operated.

Mounted upon the side walls 5 is a lower stationary die member 10carrying a suit able work clamping die 11. An upper movable die member12 is located above, and cooperates with the lower member 11, beingprovided with an upper clamping die 13 which coacts with the lower die11.

The upper die member 12 is rigidly secured to a pair of vertical spacedside rods 14 having heads 15 that rest upon said die member, said rodshaving sliding bearings 1G in the lower die member and extendingdownwardly through the chamber 7, their lower ends 17 being reduced indiameter and being slidably mounted in guideways or sockets 18 formed indiametrically opposite portions of the tubular portion 3 of the base.:

A cross head 19 connects the two side rods links 22 are located in thechamber 7 between the side rods 14, the upper ends of tending across thechamber Y7` directly be neath the lowerV die member 10. The lower endsVof these toggles vhave pivotal connections 24 with the cross head 192The central pivots 25 of said sets of toggles arec'onnect-V ed by across toggle, comprising` links 26 pivoped together 'at their center, asshown Y, at 2 I Y v Located in the tubular portion 3 of the base is avertically disposed cylinder member 2S having an upper head 29 and alower head 30,'said lowerrhead being secured in place by screws 31 whichpass througha iange 32 'formed on the lower end of' the cylinder 28 andinto the tubular portion of the base, thus securing the cylinder memberin place. It ywill be` noted that the said iange 32 is seated against anabutment shoulder l33 formed in the lower portion of thebase, thus thecylinder member is securely held in position, but is readily acces#sible and removable as will be obvious. Op`- erating inthe cylindermemberiis a reciprocatory piston 34 having a piston rod 35' that extendsupwardly 'through a stuffing vsaid toggles being mounted on pivots 23ex- V box 36 formed in the upper cylinder head ber beneath the same, theupward movement of the piston rod S35-will cause the cross toggle links26 torassume an acute angular relation, thereby drawingthe sets of sidetoggies-toward each other and causing the cross head 19 to be elevated.yThis will in turn elevate the side rods and the upper die member l2, sothat the two die members will be separated. Having introduced a toolbetween the dies, if motive fluid is now intro-- duced into the cylindermember 28 above the piston 34. and motive fluid beneath said piston isallowed to escape, it will be obvious that a downward movement of thepiston will take place, all the sets of toggles will be straightened,thereby effecting a downward movement of the cross head 19, the siderods 11i and the upper die member l2, so that the tool will beeifectively clamped by and between the dies.

Having thus fully described my invention, what claim as new, and desireto secure b j Letters atent, is

l. ln apparatus of the character set forth, the combination withcoacting die members, of a cross head connected to one of the ineinbers,toggles connecting the cross head and the other member, a cylindermember, and a piston operating therein and having toggle connectionswith said toggles.

2. ln apparatus of the character set forth, the combination withcoacting die members, of a cross head connected to one of the members,sets of toggles connecting the cross head and the other member, anotherset of toggles connecting the first mentioned sets, a cylinder member,and a piston operating therein and connected to the last mentionedtoggles.

3. In apparatus of the character set forth, the combination withcoacting die members, of spaced side rods connected to one of the same,sets of toggles connected with the side rods, a cylinder member, apiston operating in the cylinder member and means connecting the pistonwith all'of said sets of toggles for operating the saine.

4. In apparatus of the Acharacter set forth, the combination withrelatively movable coacting die members, of spaced side rods connectedto one of the die members, sets of toggles connected to the siderods, acylinder member, and a piston operating in the cylinder member ,andconnected to said sets of toggles for operating the saine, said pistonhaving a direction of movement corresponding to that of the die members.

5. ln apparatus of the character set forth, the combination withcoacting die members, of spaced side rods connected to one of themembers, sets of toggles located between and connected with the siderods, a cross toggle connecting the said sets of toggles, a cylindermember, and a piston operating in the cylinder member and connected tosaid cross toggle.

6. In apparatus of the character set forth, the combination withcoacting die members,

of spaced side rods connected to one of the Y members, a cross headconnecting the side rods, sets of toggle links interposed between theother member and the cross head, and

means for swinging said sets toward and from each other.

7. In apparatus of the character set forth, the combination withcoacting die members, of spaced side rods connected to one of themembers, a cross head connecting the side rods, sets of toggle linksinterposed between the other member and the cross head, a cross toggleconnecting the sets of toggles, and means for moving the cross toggle toswing said sets toward and from each other.

8. In apparatus of the character set forth,

the combination with a lower die member, of an upper movable die membercoacting therewith, spaced side rods connected to the upper member, across head connecting the side rods beneath the lower member, sets oftoggle links interposedl between the cross head and the lower diemember, a cylinder member located beneath the lower member, and a pistonoperating in the cylinder meinber and connecte-d to the toggle link foropa cylinder member disposed below the lower die member, and a pistonoperating therein and having an upstanding piston rod connected to thecross toggle.

l0. In apparatus of the character set forth, the combination with abase, of coacting relatively movable die members mounted thereon, siderods connected to one of the members and having upper and lower slidingbearings in the base, and means connected. to the side rods between saidbearings for moving the rods.

il. ln apparatus of the character set forth, the combination with abase, of Coacting relatively movable die membersY mounted thereon andincluding an upper movable member, side rods connected to said uppermember and slidably passing through the lower member, said side rodshaving sliding bearings at their lower ends in the base, and meansconnected to the side rods between the lower bearings and the uppermember for reciprocating the rods. i

l2. ln apparatus of the character set forth, the combination with abase, of a lower die member mounted thereon., an upper die membermovable toward and from the lower die member, spaced side rods con'nected to the upper member, said side rods slidably passing through thelower member and having slidable bearings at their lower ends in thebase, a cross head connected to the rods between the lower die memberand the sliding bearings, and means connected to the cross head forreciprocating said rods and thereby the upper die member.

13. In apparatus of the character set forth, the combination with a basecomprising a lower tubular portion and spaced side walls thereon, ofrelatively movable coacting die members arranged on the side walls, acylinder member in the tubular portion of the base, a piston operatingin the cylinder member, and means connected to the piston and to the diemembers and located between the side walls for relatively moving saiddie members. v

14. In apparatus of the character set forth, the combination with a basecomprising a lower tubular portion and spaced side walls thereon, ofrelatively movable coacting die members arranged on the side walls andincluding an upper movable member, spaced side rods connected to theupper member and having sliding bearings at their lower ends in thetubular portion of the base, a cylinder member in the tubular portion, apiston operating in the cylinder member, and means connected to thepiston and to the side rods and located between the side walls thereon,of a lower die member mount-` ed on the side walls, an upperV diememberlocated above the lower die member and movable toward and from the same,spaced` side rods carrying the upper member, said side rods slidablypassing through the lower member and having their lower ends slidablymounted in the tubular portion of the base, a cross head connecting theside rods between the side walls of the base, sets oi" toggle linksconnected to the base and to the cross head, a cross toggle connectingthe sets of toggles, an upright cylinder member located in the tubularportion of the base, and a piston operating in the cylinder member andhaving an upstanding piston rod connected to the cross toggle. s

In testimony whereoil I have hereunto set my hand in presence of twosubscribing witnesses.

ARTHUR H. siriane.

lVitnesses F. L. EMERSON, H. W. TAYLOR.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

